Anaphylactoid purpura is a small-vessel, vasculitic disease of unknown etiology, but it is thought to be caused by an immunoglobulin-mediated inflammatory process.

• 摘要: 过敏性紫斑是一处病因未明的小血管血管炎疾病，一般认为是由免疫球蛋白媒 介的发炎反应。